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Proceedings 2018, 2(8), 434; https://doi.org/10.3390/ICEM18-05323

Stress Measurement by Spectrum Analyses for Round Bar Subjected to Time-Varying Load

1
Mechanical Systems Engineering, Takushoku University, Tokyo 193-0985, Japan
2
Graduate Student in Mechanical Systems Engineering, Takushoku University, Tokyo 193-0985, Japan
Presented at the 18th International Conference on Experimental Mechanics (ICEM18), Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 11 June 2018
PDF [2353 KB, uploaded 25 June 2018]

Abstract

In this research, a feasibility study to measure the magnitude and cycle of the time-varying stress of a specimen using the natural frequency was carried out. An experiment was conducted. We used a round bar with 8 mm diameter and 290 mm span length as a specimen, which was fixed at both ends. A sinusoidal axial stress was applied to the bar. The deflection of the bar in free vibration was measured using a laser beam displacement device. To collect more information on the deflection, a device was made, which hit the bar periodically. The fast Fourier transform method, short-time Fourier transform method and wavelet analysis were applied to the deflection. The methods gave us relations among time, frequency and magnitude of the signal, with complicated representations. Applying the analyses to the experimental data, we tried to evaluate the magnitude and cycle of a time-varying load.
Keywords: spectrum analyses; time-varying stress measurement; periodic hitting device spectrum analyses; time-varying stress measurement; periodic hitting device
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yoshida, T.; Shinkou, K.; Sakurada, K.; Watanabe, T. Stress Measurement by Spectrum Analyses for Round Bar Subjected to Time-Varying Load. Proceedings 2018, 2, 434.

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